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Finding the Fourth Proportional to 1,920.77, 2,878.78 and 995.79

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Solution

The fourth proportional to 1,920.77, 2,878.78 and 995.79 is: 1,492.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.77 : 2,878.78 = 995.79 : x
  2. Step 2: Convert to fraction form
    1,920.77/2,878.78 = 995.79/x
  3. Step 3: Cross multiply
    1,920.77x = 2,878.78 × 995.79
  4. Step 4: Simplify right side
    1,920.77x = 2,866,660.34
  5. Step 5: Solve for x
    x = 2,866,660.34/1,920.77
  6. Step 6: Final answer
    x = 1,492.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.